import java.util.*;
public class e3_9{
  public static void main(String args[]){
	Scanner reader = new Scanner(System.in);
	double sum=0;
	int m=0;
	while(reader.hasNextDouble()){
	  double x = reader.nextDouble();
	  m=m+1;
	  sum=sum+x;
	}
	System.out.printf("%d个数的和为%f\n",m,sum);
	System.out.printf("%d个数的平均值是%f\n",m,sum/m);
   }
}
